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Fit AP V200R010C00 Command Reference

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arp-fake expire-time

arp-fake expire-time

Function

The arp-fake expire-time command sets the aging time of temporary ARP entries.

The undo arp-fake expire-time command restores the default aging time of temporary ARP entries.

By default, the aging time of temporary ARP entries is 1 second.

Format

arp-fake expire-time expire-time

undo arp-fake expire-time

Parameters

Parameter Description Value
expire-time Specifies the aging time of temporary ARP entries. The value is an integer that ranges from 1 to 36000, in seconds. The value is 1 second.

Views

GE interface view, Ethernet interface view, VLANIF interface view, MultiGE interface view, XGE interface view

Default Level

2: Configuration level

Usage Guidelines

When IP packets trigger ARP Miss messages, the device generates temporary ARP entries and sends ARP Request packets to the destination network.
  • In the aging time of temporary ARP entries:
    • An IP packet that is received before the ARP Reply packet and matches a temporary ARP entry is discarded and triggers no ARP Miss message.
    • After receiving the ARP Reply packet, the device generates a correct ARP entry to replace the temporary entry.
  • When temporary ARP entries age out, the device clears them. If no ARP entry matches the IP packets forwarded by the device, ARP Miss messages are triggered again and temporary ARP entries are regenerated. This process continues.

When ARP Miss attacks occur on the device, you can run the arp-fake expire-time command to extend the aging time of temporary ARP entries to reduce the frequency of triggering ARP Miss messages and minimize the impact on the device.

Example

# Set the aging time of temporary ARP entries to 10 seconds on VLANIF10.
<Huawei> system-view
[Huawei] interface vlanif 10
[Huawei-Vlanif10] arp-fake expire-time 10
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Updated: 2019-07-18

Document ID: EDOC1100064353

Views: 153539

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